Routing for multiple ISP links on Linux

Many of us have multiple ISP uplinks for different reasons like reliability, download limit, etc. but there is no clear guide [fusion_builder_container hundred_percent=”yes” overflow=”visible”][fusion_builder_row][fusion_builder_column type=”1_1″ background_position=”left top” background_color=”” border_size=”” border_color=”” border_style=”solid” spacing=”yes” background_image=”” background_repeat=”no-repeat” padding=”” margin_top=”0px” margin_bottom=”0px” class=”” id=”” animation_type=”” animation_speed=”0.3″ animation_direction=”left” hide_on_mobile=”no” center_content=”no” min_height=”none”][at least, I couldn’t find any] on routing for multiple links.

I came across the same problem — I got a new fiber connection, but it is a capped one and I have a slow ADSL link which is not capped. So I obviously would want to use the ADSL link for low priority downloads while fiber for browsing.
After a lot of researching around, I found the solution. Probably a specific case, since my computer has just one Ethernet card and I want to use both the links simultaneously on the same computer.

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